Screen sizing and separating machinery.



No. 864,828. PATENTED SEPT. 3

J. M. GALLOW. SCREEN SIZING AND SEPARATING MACHINERY.

APPLICATION FILED JULY 13, 1905. RENEWED JUNE 1, 1906.

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Inventor: JOHN M CAAAOW m I M I Attys No. 864,828. PATENTED SEPT. 8, I907.

v M. OALLOW.

SCREEN SIZING AND SEPARATING MACHINERY.

APPLICATION FILED JULY 13, 1905. RENEWED JUNE 1I 1906.

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PATENTED SEPT J. GALLOW. SCREEN SIZING AND SBPARATING MACHINERY.

APPLIOATION FILED JULY 13, 1905. RENEWED JUNE 1, 1906.

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No. 864,828. PATENTED SEPT. s, 1907.

J. M. OALLOW.

SCREEN SIZING AND SEPARATING MACHINERY. APPLICATION FILED JULY 13, 1905. RENEWED JUNE 1. 1906.

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A tt est: In ven tnr 1 JOHN M. CALLOW UNITED STATES PATENT OFFlOE.

JOHN M. OALLOW, or SALT LAKE CITY, UTA-H.

SCREEN SIZING AND SEPARATING MACHINERY.

Application filed July 13, 1905, Serial No.

To all whom it may concern:

Be it known that I, J on M. CALLOW, a subject of Great Britain, and a resident of Salt Lake City, Utah, have invented certain new and useful Improvements in Screen Sizing and Separating Machinery, of which the following is a specification accompanied by drawings.

This invention relates to improvements in screen sizing and separating machinery and more particularly to that class of machines in which an endless traveling band or belt of screen cloth is used for separating the coarse from the fines.

A machine constructed in accordance with this invention is designed more especially for screening finely divided and wet materials although it may be used with any kind of material to which it is applicable. The machine is preferably used for the wet sizing and se 'mrating oi ores, minerals, gravel, sand, earth and earthy lnatmials, bone ash, cement. and other like materials, when in a sub-divided, granular or pulverized condition. It may incidentally be used for the removing and separating of these and like materials from water or other liquids.

The objects of the invention are to improve upon the class of machines above referred to, simplify and chcapen their construction with increased efficiency in operation, prevent undue bending or straining of the scrcencloth as it. passes over the rollers and equalize the tension in the belts.

To these ends the invention consists of apparatus for carrying out the above objects, embodying the features of construction, combinations of elements and arrangement; of parts, having a general mode of operation substantially as hereinafter fully described and claimed in this specification and shown in the accompanying drawings, in which,-

Figure 1 is a longitudinal side elevation of machine; Fig. 2 is a plan view of machine; Fig. 3 is a transverse sectional view of machine on line and B of Fig. 1'; Fig. 4 is an end elevation of machine; Fig 5 is a sectional view of the driving rollers; Figs. 6 and ti are enlarged detail transverse partial end views of the cloth audits carrying belts and edges; Figs. 7 and 7- are partial enlarged detail edge and plan views respectively of the means for joining' the ends of the screen cloth; Figs. 8 and 9 are side elevatitihs oi modified forms of machines.

According to this invention the end shake of the screen is dispensed with, because with certain materials and under certain practical conditions of actual work I have found that the irrigation of the screen and the end shake of the machine are not absolutely necessary for the production of excellent results and I am thus enabled to simplify the machine in these respects for certain kinds of work and at the same time I have Specification of Letters Patent.

Patented Sept. 3, 1907.

269,463. Renewed June 1, 1906. Serial No. 319,772.

added certain improvements all of which will hereinafter appear.

Referring to the drawings, A represents'the screen cloth shown in this instance in the form of an endless band or-belt passing over the head roller B and the tail or drivingroller 0, the direction of travel being indicated by the arrows. The feed box D is provided with a sole plate or distributing board from which the materials to be screened are fed across the full width of the screen cloth A.

A wide catch box E or launder extends the full width and length of the machine to catch any drips from the lower or return side of the belt, and the oversize as it is delivered at the tail roller 0 at the end of the machine. A spray pipe. F is provided for spraying off the oversize delivered by the roller 0 into the catch launder E.

The hopper G under the working side of the screen belt catches the water and undersize that has passed through the machine and conveys it away. This hopper. G-consists of sloping ends extending from roller to roller, and transverse slopes within the same, discharging the watery undersize product to the side. opening H from whence it can be conveyed for subsequent treatment. The hopper is shown supported by cross timbers I on longitudinal timbers J fastened to brackets on the floor stands K which latter also support the boxes and shafts carrying the rollers B and C respectively.

L are driving pulleys, by which power is applied to the machines and the belt A caused to travel.

The screen cloth is shown in enlarged section in Fig. ti. A is the screen cloth, and N is an endless belt much thinner and more flexible than N to which is fastened the delicate screen cloth, by sewing, tacking or stapling, or in some equally suitable and convenient manner. This belt N is in turn fastened to the main belt M, or it may be made part of it as Fig. 6

Extending from roller to roller within the hopper G are. guide boards P which fit up under the shoulders O of the belt, and guide the belt laterally. Correspopding grooves O are provided in the rollers A & O, as shown in enlarged view in Fig. 5. The guide boards P comprise horizontal legs P which support the weight of the belts and prevent them and the screen cloth from sagging down between the rollers, and vertical leg P which prevents the tendency of the belts to curve towards each other by any sagging of the belt transversely by reason of the weight of material resting on it and thus keeps the screen cloth tight and flat across.

its full width. As a further means for guiding the belts M laterally two bearing-down wheels R R are placed abhve the roller 0 to press the belts down into the grooves and prevent any possibility of their climbing up on the roller at the shoulder point 0. In the case of the machine shown in Fig. 8 these rollers are,

of course, on the under side of roller B, since the leading or tight side. of the belt in this machine is underneath. The bearing-down rollers R R are part of the shaft S'which extends across the machine and runs in suitable bearings t F. i I

A great desideratum in the operation of the screen and in preserving the life of the screen cloth is to avoid'all undue or cross strains upon the delicate screen cloth, and it is for this purpose that the screen and its carrying belts are constructed as described,

and shown in Figs. 6 and 6". The main driving belt M is stiff and comparatively unflexible, and if the screen were attached directly to it, strains would be set up in the cloth in its travel over the rollers that would break and clestroyit along its line of juncture in the course of time, and to avoid this result, the supplementary belt piece N is interposed, which extends a sub stantial distance beyond belt M and being of much more fl xible and pliable material enables the screen to travel over the rollers without bending and distortion. Further, to prevent and avoid diagonal strains upon the screen cloth it is again important that the strain or pull on each of the belts M shall be substantially the same and at all times balanced, and since the belts are seldom or never precisely the same length, and the rollers are not generally precisely the same diameter at both ends, a special driving roller is therefore provided because the slightest variation in diameter would cause one side of the screen belt to travel faster than the other and thus put a diagonal strain upon the cloth. This roller (Fig. 5) consists of two \similar main parts a a both loose upon the shaft b, and driven by means of the differential gearing shown, in which 0 o are bevel pinions free to revolve on the studs d and (1, connected to the hub e which is keyed to the shaft 15 and revolves therewith. The pinions c c mesh with gears ff connected to the rollers aand a the rollers will revolve with the same speed so long as the tension of the two belts M remains the same, but any alteration in the relative tension of the two belts will cause the bevel pinions to revolve till the pull on both belts is again equal. To protect the gearing against dirt or grit the curved shield g is provided at the opening at the junction of the rollers.

The headroller B is in two parts like the driving roller C, but one half is keyed to the shaft, the other is loose thereon, and no differential or equalizing gearing is here necessary, because the back rollers follow the rotation of the driving rollers by means of the driving belts M. For convenience in putting on new or removing worn out cloth, the screen bands and their carrying belts are made in a single length and after passing the ends over the rollers in the machine, the two ends are 7 brought together and joined by a hinge and pin fastener Z (Figs. 7 and 7) which connects hinges Y suitably secured to the cloth.

Obviously, some features of my invention may be used without other features and the invention may be embodied in widely varied forms; one modification is shown in Fig. 8 in which instead of the tail roller C being the driving roller, the power is applied to the head roller B thus-causing the bottom side of the belt A to become the tight side and the top side tosag down into the hopper. Further, under some conditions it may be advantageous to submerge the screen and in thatcase instead of the watery undersize having a free exit through the opening H, this orifice may be plugged as at H (Fig. 8) thereby raising the water sufficiently in the hopper to submerge the screen. Fig.- 9 shows in diagram another variation, in which the ratio between the diameter of the rollers and their distance apart is reduced without in any way departing from the fundamental principle of the invention.

The action is substantially identical in all the machines, the same fundamental principle being common to them all, viz., a continuously traveling band or belt of screen cloth, the materials and water being fed to it so as to give a' skimming action on the cloth, the fines passing through and the oversize being retained and carried forward to be afterwards sprayed off as soon as it is beyond the screening area. The faster the cloth travels, the greater the quantities handled and the better quality of the work performed, its efficiency being due to the continuous presentation of a fresh clear and unblinded screening surface on which to receive the onflowing pulp.

The operation of the machine is as follows: The belt is driven by power applied to the pulleys L, and the material to be screened together with its accompanying water, is allowed to flow onto the screen belt from the feed launder D over the distributing apron D and is by it distributed across its whole width as a thin stream or film, the distributing apron being set at anangle as nearly in line with thescreen belt as possible. The water and materials skim over the' surface of the screen, and the fines and water pass through the meshes while the oversize is retained and carried forward still clinging to the screen. The oversize over the roller 0 and at a point about mid-diameter thereof, passes in front of the sprays from the pipe F which impinging on the cloth tightly stretched over the roller, wash it off into the launder E below. During all this time a fresh and thoroughly cleansed screen cloth is being presented to the onfiowing water from D D at the other end of the machine and the operations continue without intermission so long as the machine is kept in motion and furnished with materials. 'The machine is run at a speed to correspond with the quantity of material to be handled, and the quality of the work performed is also regulated by the speed at which the belt is run, which may be varied as desired as by means of the stepped pulleys L. Under' some conditions the speed may be so slow that-the oversize deposited may be of considerable thickness, under others the speed must be increased so that the oversize may not be more than the diameter of one grain thick, each individual case requiring special adjustment and regulation in this respect.

I do not herein claim anything disclosed and claimed in my co-pending application, Serial No. 286.738, filed Nov. 10, 1905.

Therefore, not limiting my invention to any one of the arrangements shown and described, nor enumerating further equivalents, I claim and desire to obtain by Letters Patent the following:

- 1. In a screen sizing and separating machine, the combination. with an endless'travcling belt or hand of screen cloth, of an end roller constructed in two parts and" differ ential gearing for-driving said parts for equalizing; the tension in the screen.

2. In a screen sizing and separating machine for screen main belts, thereby preventing undue bending strain on the screen cloth on passing over the rollers.

53. In a screen sizing and separating machine, the combination with an endless traveling belt or band of screen cloth and its end rollers, a feed box at the receiving end of the screen having a sole plate or distributing board from which the materials to be screened are fedacross the full width of the screen, a catch box or launder extending the full width of the machine, a hopper beneath the screenjor catching the under size and water, and means for sprayin'g water on the tall or oversize roller for removing the oversize from the screen, said hopper beneath the screen having sloping ends, longitudinal transverse slopes for the bottom and a side opening. I

4-. In a screen sizing and separating machine, the combi nation with an endless traveling belt or band of screen cloth and its end rollers, a feed box at the receiving end oi. the screen having a sole plate or distributing board from which the materials to be screened are fed across the full width of the screen, a catch-box or launder extending the full width of the machine, a hopper beneath the screen for catching the undersize and water, means for spraying water on the tail or oversize roller for removing the oversize from the screen, said hopper beneath the screen having sloping ends, longitudinal transverse slopes for the bottom and a side opening, and means for submerging the screening side of the screen.

In a screen sizing and separating machine, the combination with an endless traveling belt or band of screen cloth and its end rollers, a feed box at the receiving end of the-screen having a sole plate or distributing board from which the materials to be screened are fed across the full width of the screen, a catch box or launder extending the full width of the machine, a hopper beneath the screen for ing sloping ends, longitudinal transverse slopes for the bottom and a side opening, and means for varying the speed of the screen.

G. In a screen sizing and separating machine, the combination with an endless traveling belt or band of screen cloth and its end rollers, a feed box at the receiving end of the screen having a sole plate or distributing board from which the materials to be screened are fed across the full width of the screen, a catch box or launder extending the full width of the machine, a hopper beneath the screen for catching the undersi ze and water, means for spraying water on the tall or oversize roller for removing the oversize from the screen, said hopper beneath the screen hav ing sloping ends, longitudinal transverse slopes for the bottom unda side opening, and means for guiding the screen laterally.

7. In a screen sizing and separating machine, the combination with an endless travelinglbelt or band of screen cloth and its end rollers, a feed box at the receiving'end oi! the screen having a ,sole plate or distributing board from which the materials to be screened are fed across the full width of the screen, a catch box or launder extending the full width of the machine, a hopper beneath the screen for catching the under-size and water, means for spraying water on the tail or oversize roller for removing the oversize from the screen, said hopper beneath the screen having sloping ends, longitudinal transverse slopes for the bottom and a side opening, means for guiding the screen laterally, and means for vertically supporting the screening side ofthe screen.

8. In a screen sizing and separating machine, the corn-,

, bination with an endless traveling belt or band of screen cloth and its end rollers, a feed box at the receiving end of the screen having a sole plate or distributing board 7 full width of the screen, a catch box or launder-"extending the full width of the machine, a hopper beneath the screen for catching the undersize and water, means for spraying water on the tall or oversize roller for removing the oversize tom the screen, said hopper beneath the screen having sloping ends, longitudinal transverse slopes'for the bottom and a side opening, means for guiding the screen laterally, means for vertically supporting the screening side of the screen, and means for preventing the sagging of the screen transversely, I

9. In a screen sizing and separating machine, the combination with an endless traveling belt or band of screen cloth and its end rollers, a feed box at the receiving end of the screen having a sole plate or distributing board from which the materials to be'screened are fed across the full width of the screen, a catch box or launder extending the full width of the machine, a hopper beneath the screen for catching the undersize and water, and means for spraying water on the tail or oversize roller for removing the oversize from the screen, said hopper beneath the .screen having sloping ends, longitudinal'transverse slopes for the bottom and a side opening, guide bars extending longitudinally of the machine and supporting the upper side of the screen, said guide bars having horizontallegs for supporting the screen, and vertical legs for preventing the screen trom curving and sagging transversely. v

10. In a screen sizing and separating machine, the coin bination with an endless traveling belt or band of screen full width of the screen, a catch box or launder extending the' full width of the machine, a hopper beneath the screen for catching the undersize and water, means for spraying water' on the taller oversize roller for removing the oversize from the screen, said hopper beneatlythe screen having sloping ends, longitudinal transverse slopes for the bottom and a side opening, and bearing down wlteels eoiipcrnting with the tail roller.

11. In a screen sizing and separating'machine, the combination with an endless traveling belt or band of screen cloth and its end rollers, the driving roller being c'onstrncted in' two parts, and differential gearing for driving said parts for equalizing the tension in'the screen, a dis trlbuting feed board or apron at the receiving end of the screen, a hopper beneath the screen for catching the undersize and water, and means for spraying water on the tail or oversize roller for removing the oversiz ejrom the screen.

12. In a screen sizing and separating machine, the coinbination with an endless traveling belt or band of screen cloth, 9)? guide bars extending longitudinally oi the machine i'or supporting the upper side of the screen, said rollers and guide bars being constructed to cooperate with the screen, whereby said screen is guided and prevented from curving and sagging transversely, a distributing feed I board or apron at the receiving end of the screen, a hopper beneath the screen for catching the undersize and water,

and means for preventing a diagonal strain from being placed upon the cloth in passing over the rollers.

13. In a screen sizing and separating machine, the combinatlon with an endless traveling belt or band of screen cloth, of end rollers for the same, one of said rollers being 

